Hello.
There are many reasons of hairfall, like dandruff, nutritional deficiencies, environmental factors like continuous exposure to ac or sunlight etc. So firstly check for those factors and try to avoid those. Avoid salty and spicy food items. Take healthy food and dry fruits. Start with 1. Amalaki rasayan powder 1 tablespoon followed by warm milk
2. Keshkanti oil of patanjali ayurved for local application
shampoo I can use according to your scalp condition.